Clean code with consistent formatting is easier to read. Writing code in a consistent way is hard.
PHP CodeSniffer https://github.com/squizlabs/PHP_CodeSniffer provides an easy way to define a coding standard and report any violations.
Slevomat Coding Standard https://github.com/slevomat/coding-standard is not a tool in itself, but a big set of rules you can apply with PHP CodeSniffer.
It is not strictly a code standard tool, but it can be used in much the same way.
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